Ink ribbon cassette



FIG. 1 is a front view of an ink ribbon cassette showing our new design,the rear view being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side view, the opposite side view being a mirror imagethereof; and,

FIG. 4 is an underneath view thereof.

The ornamental design for an ink ribbon cassette, as shown anddescribed.